I've been using a Garmin Forerunner and heart rate strap for at least 13 years. I just upgraded to the Forerunner 265 and HRM-Pro Plus. I have had Afib in the past and I'm on a beta-blocker. My heart rate routinely includes many premature beats while resting. I'm finding that the HRM-Pro Plus shows an incorrect (high) HR while I'm resting between reps of running or strength. The HR drops a little, but not much. This did not happen with my older equipment. I'm wondering if the HR algorithm has changed. I found another post that described how the current algorithm works and why it may be inaccurate as it may be based on the shortest interval rather than the average interval. I think my old strap was a Garmin HRG1G. Do I need to go back to an old strap or a different brand strap? I guess I could also just use the wrist sensor but I wanted greater accuracy. At this point I plan to send back my new strap as it's somewhat useless to me.
